Malicious PDF — malware analysis report

Static analysis result for SHA-256 7854d319f87c99c3…

MALICIOUS

PDF

44.5 KB Created: 2020-10-15 07:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 948ea8fffea5cc68bd0acc2cb8abe567 SHA-1: 51c8fa0032d4c948bca37511beb32f2efae92cf5 SHA-256: 7854d319f87c99c3ad879ef41be3702a528a587cfdb2829a5dda693f5ec8599a
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=factoring+trinomials+worksheet+mixed In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f87381b3d63f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f8726df28065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f879c3ebbf04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f87c559af45f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f873804757ed.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kubokujada-kijezubat-muxin.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/rijivigetes_dezegupoxope_soxetexitoja_dubigokowa.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/6824412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5601/2191/files/1419305233.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2423/8757/files/the_eye_worksheet_grade_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5010/6532/files/27476223908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/68423255273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/mens_duffle_coat_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/fisowumebanazuvovijaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/6329602743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29908527-7d38-4bef-8524-b92e345c7093/lixiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb28566-d5a3-4bc8-822f-b2300a181c7f/lonijerenuzosifepuwemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec6b4f2-9be5-4015-ad2a-783a1580727b/1655712966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b4fb8c-6657-4e1a-a329-a1ede253737a/41921335361.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4953/9989/files/miwolaxabisibapusototaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5964/1025/files/us_history_eoc_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7862/3138/files/pusosebojizosufutamud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/7306/9990/files/1970_challenger_ta_value.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D91 5532 bytes
SHA-256: 23c0aef073a80daf40436ac146ec1f5c7d4de6b9aeaf9b3edecc3e167ee96600
font_01_sfnt_off00008042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8042 10668 bytes
SHA-256: b92915b4b8871ccd800fe2d73381a1ff9e81785d7fc3aff93456f071e34bace9